Abstract Factory
	UI Toolkit that supports multiple UI styles

	Network diagramming tool that supports different vendor's equipment (different icons for switches, routers, hubs, wireless access points, etc.)

	Generic graph editor (createNode, createLink, ...)
	
	Abstract Factory for instantiating different kinds of data structures
		(createList, createSet, createMap, etc.)

	Different levels of difficulty in a computer game
		abstract factory creates different kinds of characters, objects, obstacles
		BeginnerFactory, IntermediateFactory, ExpertFactory


Builder
	Constructing a complex object piece-by-piece
	
	Syntax-directed Translation

	Converting data files between different formats
		Word -> Word Perfect, RTF -> PDF, etc.)

	Programming tools (compilers, lint, etc.)
		source -> parse tree
		source(language A) -> source(language B)
	
	SAX XML Parser
		Convert XML to other representations
		Search XML document for information

	Builders often create composites

	Builder could use AbstractFactory to create piece objects
		
	Operations in Builder interface determined by the format being parsed



Factory Method
	Abstract framework class delegates creation of objects to subclasses
	Microsoft Foundation Classes (MFC)
		framework for building Windows applications
		Application, Document, View
		factory methods for creating documents and views


	Collection.iterator method in Java

	
	java.net
	class URL {
		URLConnection openConnection();	// factory method
	}
	abstract class URLConnection {
		abstract InputStream getInputStream();		// factory method
		abstract OutputStream getOutputStream();	// factory method
	}
	class HttpURLConnection {
		InputStream getInputStream();		// factory method
		OutputStream getOutputStream();	// factory method
	}

	
	JDBC
	interface Driver {
		Connection connect(String url, Properties info);	// factory method
	}
	interface Connection {
		Statement createStatement();	// factory method
	}
	interface Statement {
		ResultSet executeQuery(String sql);	// factory method
	}
	

	An Abstract Factory is a bunch of factory methods that create a family of related objects